Core-making machine



G. A. BURMAN cons MAKING mourns Nov. 24, 1925.

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Nov. 24, 1925 1,563,156

G. A. BURMAN cons MAKING mamas Fi led Segt. 2 1923 4 Sheets-Sheet 2 /1 I 1 u I a F i ,1

attoi W011 G. A. BUiRMAN GORE MAKING MACHINE- Filed Sept. 1923 4.Sheets-Shet 'ew ye fljarman Y 1563156 ("35. M. @UWMAN CORE MAKING MACHINE 35 a; progressive pneumatio c'ontrol w .50 cf the enema Noe 24, 1192s.

UNITED oommxiwe To all whom it may 0011 m.-

acitizen of the United States; re'sidifigi at Detroit, in the county of Wayne and State 5 of Michigan, have invented ltfiih new and v I useful Improvements in "Gm eMaking lmwlomes of which the followin is gspeoh fication.

This invention relates to machines; for

10 making cores and moulds with the aid of 1 pneumatic pressure. It i not broadly new te use pyeumatic prjessuie in packing @oro boxes --or mould boxee Sew-m1 "iio'rx patents Show various contrivancos flp 16 pm-anus t accomplish this purpose It is th Ob'ect of the present ihvoi tionto provide improved apparatus for" making 'cores and moulds;

- fot' measurably lesseningthe flew" of semi back through the air pipes when the iifie] "1" t are exhausting so as to avoid cutting the valve.

' 18 Anothen'fature is a pnem notio oofitrolidfl ram fOIKH SB when the sand stiks in chute for charging thesond resorvoin This? can be controlled. in jflxtzi positidn with the other air controls so that the operator irnzjzy aojquickl force the and down, through the charginghopper without having ti stop the operation of the machine-and decrease the hourly 'edre and mould product-ion;

' Another feature of the improvement h opens the slide valve allowing the aiid to drop by raising the table On which t :e core bdx' rests, then ap lies the pzieumatio' rsiire in the air' an sandreserv'oiriof o a ing" 46 ment of the contrel' handle these various. oontrol-l d dev iees are [re-'- neumatically eased; v v

Fig. 1 is a Side-elevation Y t lya sectlon apparatus'taken-on t lig l -Fig. 3 is s; vertical cross-stidii bf the I valve fo Be 1t known that L'G' oi-min A. B' iRMAfi; '2

'T g the improved. -features ar e the jidllowingg I v r A baffle 1 P vided in the sand res wbi bly, the top of the po through the air and sand reeewoie and actuates the core boxlolamp to release the same, then reverses th 'movenient' of the 4a slide valve ondoo're box olam", f llowed eo owl alm t t 51s; a plah v the same; A v

bel ef-1 o 1i Figflififi V w tol (2 some tolgen th 1113?; 7

giigea to 16 inelugive tifih oi? the valve a fia valve mg egotjon ofthe lite of 1%; 1% 14am iii 'w of w gain 6 he lifi gtittifiary-itii pie-tea ie'odjustoble i by meahs of t -swwiz we the ham} vidod iiiit f; t1 f .eion of heptab obeforre the isjflse be adjusted to aooom rnodat the apfisa tojmouldg and ooi io boxes of v dff heights Tho spider It is odjqta.;=

This sw oft the 's'flhd ofgli g' bolow mg suspeficid t jiii" reservoir kj whik h 11% a the bottom ofith whats fit is desirable to .inunierous 1116111 Th s sfl' i toejeet; @116 e the-died go the food m a a I g; 6 wort a; station tithe ame. w

t y the iiiits it;

separate the sand from the air in the exhausting o oration.

Above t e sand. and air reservoir is a sand charging hopper 'j and 'a slide -valve p jguardsthe passage from this hopper into thesand and air reservoir. In the prior art this slide valve has been operatedby hand eating this slide valve Whenthe proper port is opened air will I enter the cylinder g through the pipe line B thusfforcing' the piston t forward and forcing the slide valve over the hopper mouth so as to cut. off .the communication between the hopper and the sand reservoir.

The upper part of the sand reservoir k' is provided with a rubber gasket r upon which the slide. valve rests. As thetable is raised the core box and table isforced up "againstthe bottom .of'the sand reservoir thereby pinching'the'slide valve between the spider.

I f p p [713021 inclusive isused. Very often sand which is.= wet and most" It and the sandreservoir;

" will stick and will not drop downp This 1 would require the stopping ofthe'operation' and the climbing to'a vantage point and ramming the sand down by hand. However, I

provide a very quick control for handling such a situation. A ram m'is provided on erated from the. air cylinder g which has a pipe connection 30 and 31 with a valve 1 which is detailed in Fig. 3. By turning thevalve into theposition shown in Fig. 3-in full lines, air is fed through the air line 30 and let into the cylinder-and the r'am' is i forced against the sand in the reservoir'to I by, the cylinder, 5.

i the stationary dislodge it. I 90 degrees as shown by the dotted linesthe The mould or c ore box which is'desig'nated 2 is. clamped to the table by means of the abutment 3 and the side 'clamp. controlled- The piston in this cylQf" inder is controlled by air-entering into-eitherthe pipe A or B to withdraw or force the piston forward. The control will be do? scribed shortly.

The table lb is raised, by air admittedto piston at through the conduit C cgntrolle in a manner soon to be detaile air and sand cylinder through the conduit D. which is controlled from the common talities can be varied but as already de-" in' the By turning the valve through} branch conduit A? leads scribed, they comprise in the progression of their application; first the slide valve 32 for charging the sand and air reservoir; second, the clamp 4; for clamping the core and mould "andsandreservoir for charging the mould or co re box. These are all controlled by the'valve in the valve casing 7 It will be noted that'eachpf the pipes A, B, C"

and D returns to this valve casing and each of these pipeshas a portA, B, C and'l) valve casing. The air enters the valve casing through the air main 8 and the branchpipe 9, carries itto the ram cylinder and to the air nozzle 6 which are controlled by separate valves as their operation is at noset time- The other four instrumentali tiesfare-operated and A conical valve lt) such as shown in Figs.

vconnectedvvith ahandle 11 (Fig. 5) which swingso'vera segment 12 where the four positions of the valve are marked. ,A detent l3 (see Fig.22 tends to keep the handle in any one of the our operative positions. The off position is shown at the lower endof the segment depicted in Fig. 5. In this position released in'theiorder already'indicated.* I

This valve is the valve and the ports havethe relative positions shown in Fig. 8. The first operation is to move the handle to theposition No. 1. The valve andthe ports in thpir relative relation are now shown in Fig. 9.

. It will be seen'that the interior of the conical valve whichis in direct communication with the air. main-is now open to the port A and f consequently the air under-pressure flows through the conduit A. to the slide valve cylinder g, putting into communication the hopper with the air and sand reserwoir. A to the cylinder 5 controlling the core box clamp and forces to receive the core box. Turning the valve handle toposition No. 2 (seeFi-g. 5)v brings theovalve and the: casing into the relation shown in Fig. 10. Here the air main. is connected up directlywith the port B while the port A 'exhausts through the exhaust groove A." The ort'B-connect's through the pipe .8 with t e slide valve oil the hopper from. the sand reservoir.

. 1 flihe branch conduit B" actuates the si? The air is let in behind the-contents of the e clamp 4 to clampthe core box 2 against t abutment 3. Inorder to' understand the exexact construction of the groove 14 connects through the vertical assage 15 with a second groove 16 inthe ot-,' 'tomofi the conical valve. In the bottom of? the valve casing are a plurality of ports 17 cylinder itoshut I in the piston backwardly in'aposition ready 1 sage 16 at all times so hence when the seg- (see Fig. 6). These connect with thelpas mental groove 14 registers with the port A f as shown in Fig. 1.0, a direct :connection.-with h m sphere is established. I

i The handle is next moved to the position (Fig. The position of the parts are now as shown in Fig. 11. V

the conical valve is in communlcatmn with -the port C and hence air under pressure is The interior of furnished through the pipe C to the 'sta- .tionary piston d and serves to lift the table and clamp the mould or corebox directly it against the air and sand reservoir is. The portlB is still open to hold theside clamp in position'tor the passageway 18 in the valvestill communicates with the portB.

' The slide valve is of coursefalso held-in a ":closed position- This is accomplished by the fact that the port B is located at a5 'xzhigher. level in the'valvecasi n .than' the ports A and C (see Fig. 4). T epassage-* way connects with the slot 19 in the side of the ,valve leading to the interior of, the same as indicated in Fig. 11. .The'air'is now on in both the pipes C and Bf. The

side clamp is held against the mould-or 1 core box and the table isheld against the bottom of the airand sand reservoir. Now, in the fourth position shown in Fig. 5 the parts are as shown in Fig. 12, the way 18 still connects with the port igassagehence the air is still in direct communication with {table is "allowed drop.

the conduits B and B" and the airv is also still in direct connection with the port Ghecause of the passagewayflfi and additionally in .direct connection with the. ports D--D for the slots 19 and 20in thesideof the conical valve register with these ports D-D. This supplies air under pressure to the conduits D-D. NOW, referring to, Fig. 1, it will; be seen that this furnishes the blow-i QThe air islet into-the. air cylinder behind the contents and the same is expelled through the discharge orifice m into themould box or core box. h V V Referring to Figs. 18 to'16 inclusive, the

arrangement ,for the release of the air presport A is already exhausted this position does not afiect port A. When the valve turns to the next position, which is the po'sitionNo. 2 in Fig. 5, the arts'will assume-the-position-shown in lg. 14. This position begins :to exhaust; pg}: G and the enIthe-first )osition'on the segment shown in Fig.

isreached, the parts will be in the position shown in Fig 15. Port B willnow be cu- .Ihausted and port A will be in direct coml imunication with the air main, air is let in cylinders g and '5 through the pipes A and A.' "respectivelytherebyopenmg the slide valve and releasing the corebox clamp. The inverted: L shaped e'xhaustipassage 17 registers with'the port '13 and consequently exhausts the air from the cylinder 9 and through theconduit B and the conduit released. It will be noted that the air pressure applies the 'device in the following order; firstjit opens the slide valve and releases the clamp, then clamps the core box tothe tableand closes the slide valve, then raises the table-and finally blows the 55 sand.- {The'n on the return movement of the valve handle the air for the blow. is first Hence all the contrivances. will be released, then the table, and finally the side i clampf-and slide;- valve are actuated as (18-yscribed. ';In' letting the air. through these v .various-icontrivances the opening and closmg movement will be a" step by, step move- In the" e eratio ifof the machine itwill T be noticed t at'the port A is opened during his the return. movement of the valve. oper-' -'ating lever. .-As,described; this'fOrceS air under pressure to. the cylinder'q and 5 Y throngh the conduits A. and A respectivellyl'. ,While themachineiis at'rest and'while' t e handle is, located in the ofi-position, pressure will be maintained in the cylinder T g'and '5 tending to hold the slide valve and side clamp in an open position. Obviously I when the valve operating handle is again .moved to start-the pneumatic operation of the machine the port A will again be opened and in direct communication with the air .withdrawthepiston, there is no work done ',while'the machine is at rest, t e o erator ,isable toiwork the ram. w to loosen te sand a'ndair, the sand to'pass from the hopper thefcore boxv on blowing another core. WhatI claimis:

into the sand reservoir. This may be con" veniently donejwhile the helper-is placing the table preparatory to mains But 'sincethe cylinders g and 5' are I already charged 'with compressed -air to when the valvefis'in this position. Because ofthe fact'that the slidevalveisopened 1 t 1 2 '1. In apparatus-for thepurposedescribed,

the combination of an air and sand reservoir, provided with a dischargeyorifice. means. for conducting air under pressure thereto, a hopper for charging said reser-- vvoir with 'sand through a passage provided with a valve to guard said passageway, and

-means'for ramming down the sand when] it sticks in such passage way. 2. In apparatusfor th e purpose described;

the combination of an air and sand reseri voir, provided with a discharge port, means for furnishing air under pressure thereto, a hopperffor charging the reservoir with sand through a passageway provided with a valve, and =power-operatcd means controllable from a remote point for ramming the sand down through said discharge passage.

3, In apparatus for the purpose described, the combination of van air and sand reser-' voir, means. for affording air under pressure thereto, a hopper for charging the reservoir withsand through a passage way provided with a valve to guard the same,-a reciprocating rain contained in the hopper, and a pneumatic cylinder and piston for operating.

said ram. 7

at, In apparatus for the purpose described, the combinationof an air and sand reserrvoir provided with a discharge orifice, a vertically reciprocating table, "aside clamp -forthemould or core box, and means including a single control for successively opera-ting the side clamp and holding the same closed while raising the table and furnishing air i nder pressure to the air and sand reservoir.

5. In apparatus for the purpose described, the combination ofan air and sandrese'rvoir, means for furnishing air under'pressure thereto, a pneumatically raised table, a

pneumatically operated side clamp, and

pneumatic'means including a single control for successively applying the side clamp and holding the same closed while raising the table, and furnishing air under pressure to the air and sand reservoir. 4

6. In apparatus for the purposedescribed,

the combination of a stationary air andsand reservoir, means for furnishing air under pressure thereto, a stationary hopper for charging the air and sand reservoir with sand provided with a valve for cutting off and establishing communication between the hopper and. the air and sand reservoir,- a vertically reciprocating table, and means including a single control for progressively opening and closing the valve in thefsand hopper, raising thetable, and furnishing air under pressure to the airand'said reservoir. 7, In apparatus for the purposedescribed,

the, combination :cfa stationary air andsand reservoir, a stationaryli'opper for] charging the reservoir with sand and pro-1f [Vldfid with a valve for closing thepassage -way between the hopper and the reservoir, a reciprocating table, a ,side clamp-"andmeansj including a single control progressively op erahle for causing the valvebelow the hopper to open and close, 'andto actuate the side clamp to the mold box or 'corebox, to

raise the table, and to cause airunder. ,pressure td flow into the air and sand reservoir. 8. In apparatus for the purpose described, the combination of an air and sand reservoir provided with a discharge orifice in its bottom, means for furnishing air thereto under pressure, a hopper for charging the reservoir with sand provided with a valve for guarding the passageway between the hopper and the reservoir, a pneumatic. cylinder and piston for opening and closing said valve, a pneumatically operated vertically reciprocating table, a pneumatically operated horizontallyreciprocating side clamp and pneumatic means including a single valve for successively opening and closing the valve in the hopper and applying the side clamp to the core box, raising the table, and allowing air under pressure to flow into the air and sand reservoir to effect the blow.

' 9. In apparatus for the purpose described,

the combination of anair and sand reservoir, means for furnishing air under pressure thereto, a sand hopper for charging the reservoir with sand, a slide valve for guarding said hopper passageway into the reservoir, a pneumatic piston and cylinder for controlling said slide valve, a vertically reciprocating table pneumatically operated, and pneumatic means including a single valve ior progressively operating said in strumentalities and releasing the same by controlling the inlets for the air under pressure and the exhaust thereof.

' 10. In apparatusfor the purpose described,

:the combination of an air and .sand reservoir provided] with a discharge orifice in the bottom thereof, means for furnishing air under pressure thereto, a sand hopper for'discharging sand ,thereinto, a valve for guarding the same pneumatically operated,

a vertically reciprocating pneumatically 0 erated table, a pneumatically operated si e clamp on said table and connections including a single means for controlling the pneumatic operation of the hopper valve to open the valve and then close the same,

for then applying the side clamp, for raising the table and finally for letting air under pressure into the reservoir, said control fmeans having the capacity for releasing the air under the table, the air in the side clamp and the air the reservoir.

"i 11."In' apparatus for the purpose described, the combination of an air and sand reservoir, a sand hopper above the reservoir, a pneumatically operated valve for controlling the passageway from the hopper into the reservoir, a vertically reciprocating pneumatically operated table, a horizontal reciprocating pneumatically operated side clamp and a single valve whose movement 'in'one direction operates in progressioi' to .open and close-the valve in the hopper,

apply the side clamp, raise the table and let air under pressure into the reservoir. '12. In apparatus for the purpose described, the combination of an air and sand I reservoir provided with a discharge orifice,

means for conveying air under pressure thereto, a sand hopper above the reservoir, a valve for guarding the passageway between the hopper and the reservoir pneumatically operated, a vertically reciprocating pneumatically operated table, a side clamp pneumatically operated and a single valve provided with suitable connections progressively operating to openandclose the valve in I in the hopper, apply the side clamp, raise the table and let air under pressure into the reservoir and successively on the return stroke releasing the pressure in the reser voir, the pressure under the table and the 15 pressure that applies the clamp.

In testimony whereof I afiix my signature.

GEORGE A. BURMAN. 

